权国政,王阳,余春堂,董旭刚,周杰,夏玉峰

• 1:重庆大学材料科学与工程学院

摘要(Abstract)：

采用Gleeble-1500热物理模拟试验机对7050铝合金在变形温度573～723 K、应变速率0.01～10 s-1、最大压缩量80%的条件下进行了等温压缩实验,得到该合金多组真实应力-应变数据,以此作为计算应变速率敏感指数(m值)、功率耗散系数(η值)、失稳判据(ξ值)三重判据的底层材料数据。通过m值、η值和ξ值的正负分布而三重递进识别出不同应变下稳定变形参数区和失稳区,最后将不同应变下的功率耗散图和失稳图叠加以构建含应变影响的系列加工图,基于此识别出高η值和高ξ值的最优化稳定变形参数区,以及负m值、负η值和负ξ值的最大化失稳变形参数区,可以为确定最佳的热变形工艺参数提供理论指导。

关键词(KeyWords)： 铝合金;热压缩;动态材料模型;加工图;流变失稳

Abstract:

Keywords:

基金项目(Foundation): 科技部国家重大专项项目(2012ZX04010-081,G09003.8-1);; 重庆市重大科技攻关项目(cstc2009aa3012-1);; 中央高校基本科研业务费资助基金(CDJZR11130009);; 重庆大学大型仪器设备开放基金(2011063014);; 重庆大学研究生创新基金(CDJXS12130003)

作者(Author): 权国政,王阳,余春堂,董旭刚,周杰,夏玉峰

DOI: 10.13289/j.issn.1009-6264.2013.06.033

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